Primary chan tensioner thoughts

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madsundaysurvivor
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Primary chan tensioner thoughts

Post by madsundaysurvivor » Sun Mar 31, 2019 8:43 am

Hello
Does anyone run your engine without primary chain tensioner?
In other racing bikes with short primary chain I always remove the chain tensioner, less friction and forget the posible problems with it. Once I broke the tensinoner and blocked the chainwheell and I left flying several meters....
If I remove it, will I have very premature wear of teeth? Will I have sonorous clonk-clonk-clonk?
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Re: Primary chan tensioner thoughts

Post by minetymenace » Sun Mar 31, 2019 5:28 pm

B50s are regularly raced without tensioners, B25s I think there is too much slop to start with so need them fitted.
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Re: Primary chan tensioner thoughts

Post by skippy » Sun Mar 31, 2019 9:46 pm

My pes chain doesn’t need a tensioner
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Re: Primary chan tensioner thoughts

Post by Jeff K » Mon Apr 01, 2019 10:51 pm

While Building the B40 project we tried three different primary chains from two different brands. One was so tight that it over heated the primary and did not "bed" in. The other two fit well and had no slop for a tensioner to take up. I spoke to Ed V. about this and he laughed and said he noted this long time ago and wrote it off to BSA and or Chain manufacturing tolerances.
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Re: Primary chan tensioner thoughts

Post by madsundaysurvivor » Tue Apr 02, 2019 2:50 pm

Thank you for your answers
In english bikes I usually use renold chains, in b25 fit well. I think the slop is correct about 5mm up and down
but I did not know if with the km it would de-stress and touch the alternator studs if it runs without tensioner.
In other european motorcycles I use regina chains

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